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Polystichum imbricans  
Family: Dryopteridaceae
Polystichum imbricans image
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David H. Wagner in Flora of North America (vol. 2)
Stems ascending to erect. Leaves erect to arching back at tip, 2--8 dm; bulblets absent. Petiole 1/4--1/3 length of leaf; scales abruptly diminishing in size distally and falling off early but retaining conspicuous tuft of brown scales at base. Blade linear-lanceolate to linear, 1-pinnate, base not or slightly narrowed. Pinnae oblong, slenderly lanceolate, or falcate, usually overlapping, in 1 plane or twisted out of plane of blade, 2--4 cm; base oblique, auricles well developed; margins serrulate-spiny with teeth ascending; apex cuspidate or apiculate with subapical teeth smaller than apical tooth; microscales lanceolate to linear with straight or sharply angular projections, sparse, on abaxial surface only. Indusia entire to sharply dentate. Spores dark brown. Polystichum imbricans is one of the postulated ancestors of two allopolyploids, P . californicum and P . scopulinum (D. H. Wagner 1979). Relationships to P . munitum are discussed under that species.

Polystichum imbricans
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The PCC, and this data portal, were made possible by funding from the National Science Foundation’s Advancing Digitization of Biological Collections (ADBC) program, grant numbers 1802504, 1802352, 1802134, 1802033, 1802270, 1802255, 1802239, 1802446, 1802305.
The pteridoportal taxonomic thesaurus is based on the Checklist of Ferns and Lycophytes of the World, generously provided by Michael Hassler.